What is inverter clipping?
Inverter clipping happens when the DC power from a solar array exceeds the maximum AC output capacity of the inverter, causing power loss during peak sunlight hours.
When a solar array generates more DC power than an inverter can convert to AC, the inverter must limit its output to stay within its rated capacity. This loss of potential generation is called clipping. It occurs most often during midday hours when irradiance is highest and the array produces its peak power.
Clipping is a direct consequence of oversizing, a common design practice in Perth Metropolitan installations. Solar installers often specify DC arrays 20-40% larger than the inverter's AC rating to improve annual energy yield and offset degradation over the system's life. While this strategy increases total generation, it also guarantees some power loss on clear summer days when the sun is strongest.
The economics of clipping reflect a trade-off. The cost of adding extra panels and wiring is lower than upgrading to a larger inverter, so the lost power on peak days is often cheaper to absorb than to prevent. Modern monitoring systems can reveal clipping patterns, showing how many hours per year the array is curtailed. For system owners in Perth, where cloud-free days are frequent, understanding clipping helps explain why maximum array output does not always match inverter capacity ratings.
Equipment suppliers often consult on solar inverter selection using these oversizing ratios as a starting point, balancing budget and expected energy production.